JDK 9 RFR of 8050499: (ch) NativeSignal.signal fails with error 316 on OS X

[Brian Burkhalter]

On Jan 5, 2016, at 4:34 AM, Alan Bateman <Alan.Bateman at oracle.com> wrote:

>> On OSX ignore ESRCH returned by pthread_kill().
>> 
> As a temporary fix then I think this probably okay but I assume the real issue here is that readerThread/writerThread are being set/cleared without stateLock. Maybe it's time to address this and also look at ServerSocketChannelImpl which I assume has the same issue. We can also look at SocketChannelImpl where this issue has been fixed but where readerThread/writerThread has been left as volatile and this might not be needed now.

Yes, I saw the comments in the issue that further work might be necessary in this area. Would it be appropriate to resolve this issue with the current patch and file another, separate issue to follow up the aforementioned root cause(s)?

> For the test then it might be good to rename it something like StressNativeSignal or something else that makes it clearer what the test is for.
> 
> One other question about the test, can it run on all platforms? I assume @requires os.family == "mac" is not needed.

The above changes are made in this patch:

http://cr.openjdk.java.net/~bpb/8050499/webrev.01/

I’ll run it on all platforms also.

Brian
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